Landon Douglas Cassill (born July 7, 1989) is an American professional driver. He currently competes full-time in the Monster Energy NASCAR Cup Series, driving the No. 34 Ford Fusion for Front Row Motorsports.

Cassill was born in Cedar Rapids, Iowa, and began racing on a quad when he was 3 years old. Cassill moved to go-karts. He finished second in the Pro Kart Tour at Atlanta Motor Speedway at age 10. The following year, he earned his first of two Kart Series national championships. Cassill won four International Kart Federation (IKF) championships, some on dirt and some on asphalt.

In 2000, Cassill competed in three different classes: two karting and a midget class. He won all three state championships on the same night. Cassill won four more state championships at the Newton Kart Klub in Newton, Iowa in 2001. He then started racing in a modified at the half mile Hawkeye Downs.

He was racing in the ASA Late Model Series (ASALMS) in 2003 while he was in high school at Jefferson High School in Cedar Rapids. He has also raced in legend, , and late model racecars. Other series include the American Speed Association and the CRA Super Series.

At age 16, he became the youngest winner in ASALMS history when he won at Lake Erie Speedway on June 9, 2006; holding the record until Erik Jones surpassed him at age 14 in 2010. On July 3, Cassill won his second ASALMS race, this time in a Southern Division race at South Georgia Motorsports Park near Cecil, Georgia. The win made him the first driver to win in both the Northern and Southern Divisions. He won his first Challenge Division race at I-70 Speedway on July 8 to become the first driver to win in all three divisions. He finished second in the Challenge Division points behind Kelly Bires, and eleventh in the Northern Division despite starting in half of the races.

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